A higher wattage adapter can charge anything
with the same or lower wattage. For example, a 65 watt adapter can charge a 65
watt notebook or a 40 watt notebook. A 90 watt adapter can charge a 90 watt
notebook, a 65 watt notebook, and a 40 watt notebook.

Ah stands for Amp Hour, a technical term for how
much energy a battery will store. Batteries with higher Ah values are able to
last longer between charges. The higher the number, the more energy a battery
can store.

New Laptop Battery Calibration. If your new
battery charges but does not charge to 100% or stops charging each time your charge
indicator reaches 85-99%, you may need to recalibrate your laptop for the new
battery. This occurs often when replacing an old battery with a new battery.
The laptop has to adjust itself to get used to the new battery. In order to
recalibrate properly, you will need to set the Windows power management so the
laptop does not go into standby or hibernation when the battery gets low.
Instructions: With Windows XP, navigate to Control Panel > Performance and
Maintenance > Power Options. Set "Power Schemes" to "Always
On". Under "Alarms", uncheck "Low battery alarm" and
"Critical battery alarm". Under "Hibernate", uncheck
"Enable hibernation", then click on Apply. With Windows Vista,
navigate to Control Panel > Performance and Maintenance > Power Options
Click "Change Plan Settings". Set all tabs to "Never"
underneath "On Battery" column. Click "Change advanced power
settings". Set Sleep > Hibernate after to 0 or Never. Set Battery >
Critical Battery Level to 0. Click on "OK", then "Save
Changes". This is the only time that we recommend taking the battery all
the way down to zero percent. Unplug the ac adapter, and let the battery drain
all the way down until the laptop shuts off. Then plug the AC adapter back in,
and let it recharge to 100%. You may need to repeat the cycle 2-3 times before
it actually reaches 100%.

mAh stands for Milliamp Hour, a technical term
for how much energy a battery will store. Batteries with higher mAh values are
able to last longer between charges. The higher the number, the more energy a
battery can store.

To be kept on a charge continuously a
"float" charge is needed. A float charger will deliver a lower
voltage charge (2-v range) consistently and will can help keep a SLA battery in
good working condition for long periods of time.

At a full 12-14v charge, the
charger needs to be removed as soon as the battery is charged or the plates can
become corroded and a battery can be ruined in days or weeks. Unregulated
Transformer-Based Chargers, should be removed right
away after a full charge is achieved.

For a float charge a more sophisticated
charger is needed. If a unit is being unused for an extended period of time it
should be stored in a cool place with a float charge on it. Otherwise the
charge of the battery should be constantly monitored, making sure it is never
fully discharged, and charged periodically with the charger being removed as
soon as a full charge is reached.

If maintained properly a sealed lead acid
battery will last up to 5 years. However just one extended discharge can render
an SLA battery useless. Even a near deep discharge can greatly reduce the
amount of charge a battery will ever be able to retain. An SLA should never be
fully discharged, as the battery does not need to be periodically discharged in
order to maintain its performance, in fact, it is best kept in a fully charged
state at all times. SLA batteries can also be damaged by overcharging. A
charger should be removed as soon as the battery has reached its full charge.
They should be stored in a cool place when not in use, and can be damaged if
stored in a hot area for an extended period of time.